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I gave up on batteries years ago far too expensive and unreliable. I now use a portable generator (2KVA) of the quiet type ($600), electric/remote start/stop. I use a sound proof box as well. On my normal load of caravan, five computers, telescope/mount and camera I get 12 hrs from 5 litres.
The residual noise should not worry anyone on a cold night If you have head cover. I can't hear the generator past 10 metres and set it up at the end of a 25 metre extension cord.
During the SPSP I ran the "house" and whole area from the generator using less than 1 litre of fuel/hr and supplied everyone with AC via a 12 way distribution box.
Barry
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